WO2023138204A1 - Procédé de préparation d'un catalyseur contenant du cuivre ssz-16 - Google Patents

Procédé de préparation d'un catalyseur contenant du cuivre ssz-16 Download PDF

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WO2023138204A1
WO2023138204A1 PCT/CN2022/133503 CN2022133503W WO2023138204A1 WO 2023138204 A1 WO2023138204 A1 WO 2023138204A1 CN 2022133503 W CN2022133503 W CN 2022133503W WO 2023138204 A1 WO2023138204 A1 WO 2023138204A1
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silicon
copper
ssz
aluminum
molecular sieve
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梁珂
赵吉生
梁家梓
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天津派森新材料技术有限责任公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
    • B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
    • B01J29/76—Iron group metals or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61—Surface area
    • B01J35/617—500-1000 m2/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/10—After treatment, characterised by the effect to be obtained
    • B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
    • B01J2229/183—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself in framework positions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to the technical field of catalysis, in particular to a preparation method of an SSZ-16 copper-containing catalyst.
  • Zeolite molecular sieves such as SSZ-13, SSZ-39, have shown superior activity and catalytic stability in NH3 selective catalytic reduction technology for treating NOx - containing diesel vehicle exhaust.
  • AFX molecular sieve is a small-pore molecular sieve with a unique 8-membered ring hole and cage structure. It has the characteristics of low skeleton density and high adsorption capacity, which makes it have great advantages and commercial value in all aspects.
  • highly active copper species is the key factor in the catalytic process. There is a strong correlation between the activity of copper species and the topological structure of molecular sieves.
  • the object of the present invention is to provide a method for preparing a high-performance and low-cost SSZ-16 copper-containing catalyst.
  • a preparation method of SSZ-16 copper-containing catalyst comprising the following steps:
  • Step S110 Add 40kg of N,N-dimethyl-1,4-cyclohexanediamine, 500kg of dimethyl carbonate and 20kg of pure water into a 1000L autoclave, heat up to 140.0 ⁇ 5.0°C, keep the temperature for 12.0h, and cool down to 40-50°C; transfer the reaction solution into a 1000L stainless steel kettle, distill the solvent to dryness, and add 50.0kg of pure water;
  • Step S120 mixing the template agent prepared in S110, FAU type molecular sieve, alkali source, silicon source, aluminum source, deionized water, and seed crystals to form a mixed system, and react to obtain a gel, and dynamically crystallize to obtain an alkali metal type SSZ-16 aggregate;
  • Step S130 washing the alkali metal type SSZ-16 agglomerates with water, drying once, roasting once, exchanging ammonium ions, drying twice, and performing second roasting to obtain hydrogen type SSZ-16 molecular sieve;
  • Step S140 disperse the hydrogen-type SSZ-16 molecular sieve in the copper salt solution and stir, then filter, wash, dry and roast to obtain the SSZ-16 copper-containing catalyst.
  • step S110 the template agent is:
  • step S120 the silicon in the mixed system is calculated as SiO 2 , the molar ratio of alkali source to silicon is (0.3-0.6):1, preferably (0.35-0.45):1, and the alkali source is calculated as alkali metal ion.
  • the molar ratio of silicon to aluminum in the mixed system is (5-80): 1, preferably (10-40): 1, and silicon is represented by SiO 2 In terms of aluminum as A1 2 o 3 Calculated; FAU type molecular sieve and silicon in silicon source as SiO 2
  • the molar ratio of the two is (0.15-0.30): 1, preferably (0.17-0.25): 1;
  • the silicon source is at least one of sodium silicate, silica sol, fumed silica, white carbon black, preferably silica sol or sodium silicate;
  • the aluminum source is at least one of aluminum nitrate, aluminum sulfate, aluminum oxide, aluminum hydroxide, sodium metaaluminate, pseudoboehmite, aluminum isopropoxide, preferably aluminum sulfate
  • silicon in the mixed system is calculated as SiO 2
  • the template is calculated as Chemical Formula 1 or Chemical Formula 2.
  • the molar ratio of template to silicon is (0.18-0.5):1, preferably (0.18-0.25):1.
  • the silicon in the mixed system is calculated as SiO 2 , in step S120, the mass ratio of deionized water to silicon is (10-60):1, preferably (15-20):1;
  • the silicon in the mixed system is calculated as SiO 2 .
  • the seed crystal is hydrogen SSZ-16 molecular sieve, and the mass ratio to silicon is (0.002-0.5):1, preferably (0.005-0.3):1.
  • step S120 the crystallization reaction temperature is 120°C-190°C, and the crystallization reaction time is 5h-560h.
  • step S130 the alkali metal type SSZ-16 aggregates are suction-filtered, washed with water, and then dried once in an oven at a drying temperature of 120°C-180°C and a drying time of 5h-12h.
  • step S130 the firing temperature of the primary firing is 450°C-600°C, and the firing time is 10h-40h.
  • step S130 the firing temperature of the secondary firing is 450°C-600°C, and the firing time is 5h-15h.
  • the ammonium salt used for ammonium ion exchange is at least one of ammonium sulfate, ammonium nitrate, ammonium chloride, and ammonium bicarbonate, preferably ammonium sulfate or ammonium nitrate, and the molar concentration of NH 4 + is 0.1-0.9 mol/L, preferably 0.4-0.6 mol/L.
  • step S130 the mass ratio of deionized water to the primary roasted product is (2-20):1, preferably (3-15):1.
  • the copper salt is at least one of copper acetate, copper sulfate, and copper nitrate, preferably copper acetate; the Cu molar concentration in the copper salt solution is 0.1-0.4mol/L, preferably 0.1-0.25mol/L; the mass ratio of deionized water to the hydrogen-type SSZ-16 molecular sieve prepared in step S130 (3-10): 1, preferably (3-6): 1.
  • step S140 in step S140, the stirring temperature is 50°C-85°C, and the stirring time is 2h-6h; in step S140, it is placed in an oven for drying, the drying temperature is 120°C-180°C, and the drying time is 5h-12h; in step S140, the roasting temperature is 450°C-600°C, and the roasting time is 5h-10h.
  • the molar ratio of silicon to aluminum is 5-50:1, preferably 15-25:1; the mass fraction of copper is 1-4wt%, preferably 1.5-3.3wt%; the yield is 80-85%; the acid value is 1.5-1.8mmol/g; the specific surface area is 700-750m2 /g; More than 97%; preferably, the SCR performance is that the conversion rate is more than 99.5% in the range of 200-500°C.
  • the present invention utilizes a novel structure-directing agent, and FAU itself is used as a molecular sieve.
  • silicon and aluminum can be provided for the mixed system, which are decomposed into silicon-aluminum connection fragments under the action of alkali, and then under the process conditions of the present invention, the fragments are recombined to obtain the product of the present invention.
  • the fragment itself has a certain structural stability, and the performance of the product obtained after recombination will be higher than that of other one-step hydrothermal synthesis methods to synthesize SSZ-16 copper-containing catalysts.
  • the performance of the obtained catalysts was further tested, especially the NOx selective catalytic performance. At the same time, the ratio of raw materials in the synthesis process was also optimized, and a higher yield was obtained.
  • Figure 1 is a schematic diagram of the chemical formula 1 1 H nuclear magnetic spectrum of the present invention
  • FIG. 2 is a schematic diagram of the chemical formula 1 13 C nuclear magnetic spectrum of the present invention
  • Fig. 3 is a schematic diagram of the chemical formula 2 1 H nuclear magnetic spectrum of the present invention
  • Figure 4 is a schematic diagram of the chemical formula 1 13 C nuclear magnetic spectrum of the present invention
  • Fig. 5 is the XRD spectrogram of product in the embodiment of the present invention 1
  • Fig. 6 is the XRD spectrogram of product in the embodiment of the present invention 5
  • Fig. 7 is the SCR catalytic curve figure of the product in the embodiment of the present invention 1
  • Fig. 8 is the SCR catalytic curve diagram of the product in Example 2 of the present invention.
  • Fig. 9 is the SCR catalytic curve figure of the product in the embodiment of the present invention 3.
  • Fig. 10 is the SCR catalytic curve figure of the product in the embodiment 4 of the present invention.
  • Fig. 11 is the SCR catalytic curve diagram of the product in Example 5 of the present invention.
  • Fig. 12 is the SCR catalytic curve diagram of the product in Example 6 of the present invention.
  • Fig. 13 is the SCR catalytic curve diagram of the product in comparative example 1 of the present invention.
  • Fig. 14 is the SCR catalytic curve diagram of the product in comparative example 2 of the present invention.
  • Fig. 15 is the SCR catalytic curve diagram of the product in comparative example 3 of the present invention.
  • Fig. 16 is the SCR catalytic curve diagram of the product in comparative example 4 of the present invention.
  • Step 110 Add 40kg of N,N-dimethyl-1,4-cyclohexanediamine, 500kg of dimethyl carbonate and 20kg of pure water into a 1000L autoclave, raise the temperature to 140.0 ⁇ 5.0°C, keep the temperature for 12.0h, and cool down to 40-50°C; transfer the reaction solution into a 1000L stainless steel kettle, distill the solvent to dryness, and add 50.0kg of pure water;
  • templating agent content 25wt% prepared by S110 in the 250ml flask at room temperature, FAU type molecular sieve, and potassium hydroxide (purity 98wt%), silica sol (content 30.1wt%), aluminum sulfate (purity 98wt%), deionized water, SSZ-16 seed crystals mix to form a mixed system, and react to obtain a gel, dynamic crystallization to obtain an alkali metal type SSZ-16 aggregate; in the mixed system, the molar ratio of KOH to silicon is 0. 4.
  • the molar ratio of silicon to aluminum is 28, the molar ratio of silicon of FAU type molecular sieve to silica sol is 0.2:1, the molar ratio of template agent to silicon is 0.2, the mass ratio of deionized water to silicon is 18:1, the mass ratio of seed crystal to silicon is 0.01, and the gel is prepared by stirring at 60°C for 2 hours.
  • the prepared gel was transferred into a homogeneous crystallization kettle, put into an oven, and reacted at 160° C. for 7 hours to obtain an alkali metal type SSZ-16 aggregate.
  • Silicon is counted as SiO 2
  • aluminum is counted as A1 2 O 3
  • template is counted as N,N,N,N',N',N'-hexamethyl-cyclohexyltrimethylammonium dihydroxide (chemical formula 1)
  • KOH is counted as K + .
  • the alkali metal type SSZ-16 aggregates were suction filtered out, washed 3 times with water, and dried in an oven at 140°C for 7 hours. Put it into a muffle furnace at 550°C for one calcination, and the calcination time is 10h.
  • the calcined alkali metal type SSZ-16 aggregates were ion-exchanged three times with ammonium sulfate aqueous solution, and the molar concentration of NH 4+ was 0.5mol/L.
  • the mass ratio of deionized water to primary roasted product is 7:1.
  • the ammonium ion-exchanged product was dried in an oven at 120°C for 7 hours, and then put into a muffle furnace for secondary roasting at 550°C for 8 hours to obtain a hydrogen-type SSZ-16 molecular sieve.
  • the calculated yield of the hydrogen-type SSZ-16 molecular sieve was 83%.
  • the hydrogen-type SSZ-16 molecular sieve obtained in step S130 is ion-exchanged with copper acetate solution, and the molar concentration of Cu 2+ in the copper acetate solution is 0.3mol/L; the mass ratio of deionized water to the hydrogen-type SSZ-16 molecular sieve obtained in step S130 is 4:1.
  • the reaction was stirred with magnetic force for 2h. After the reaction is completed, filter, wash, dry in an oven at 120°C for 7 hours, and bake in a muffle furnace at 550°C for 5 hours to obtain SSZ-16 copper-containing catalyst.
  • the catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 22:1, the yield of hydrogen SSZ-16 molecular sieve was 83%, and the mass ratio of copper atoms in the SSZ-16 copper-containing catalyst was 2.9%.
  • SCR catalytic performance test results show that the NOx catalytic conversion efficiency reaches 100% when the temperature reaches 190°C, and the NOx catalytic conversion efficiency maintains 100% when the temperature reaches 540°C. In the temperature range of 190°C-540°C, the NOx catalytic conversion efficiency maintains 100%, and the catalytic efficiency is stable.
  • step S120 the molar ratio of alkali source to silicon is 0.35, the molar ratio of silicon to aluminum is 25, and the molar ratio of template agent to silicon is 0.18.
  • the catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 20:1, the yield of hydrogen-type SSZ-16 molecular sieve was 85%, and the mass ratio of copper atoms in the SSZ-16 copper-containing catalyst was 3.0%.
  • SCR catalytic performance test results show that the NOx catalytic conversion efficiency reaches 100% when the temperature reaches 180°C, and the NOx catalytic conversion efficiency maintains 100% when the temperature reaches 530°C. In the temperature range of 180°C-530°C, the NOx catalytic conversion efficiency maintains 100%, and the catalytic efficiency is stable.
  • step S120 the molar ratio of alkali source to silicon is 0.42, the molar ratio of silicon to aluminum is 33, and the molar ratio of template agent to silicon is 0.22.
  • the catalyst was analyzed by X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 25:1, the yield of hydrogen SSZ-16 molecular sieve was 80%, and the mass ratio of copper atoms in SSZ-16 copper-containing catalyst was 2.7%.
  • SCR catalytic performance test results show that the NOx catalytic conversion efficiency reaches 100% when the temperature reaches 195°C, and the NOx catalytic conversion efficiency maintains 100% when the temperature reaches 510°C. In the temperature range of 195°C-510°C, the NOx catalytic conversion efficiency maintains 100%, and the catalytic efficiency is stable.
  • step S120 the template used is N,N,N,N',N',N'-hexamethyl-cyclohexyltrimethylammonium dihydroxide (chemical formula 2).
  • the catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 22:1, the yield of hydrogen-type SSZ-16 molecular sieve was 82%, and the mass ratio of copper atoms in the SSZ-16 copper-containing catalyst was 2.9%. According to the test results of SCR catalytic performance, the NOx catalytic conversion efficiency at low temperature of 185°C reaches over 97%, and at high temperature of 530°C, the NOx catalytic conversion efficiency remains above 98%. In the temperature range of 185°C-530°C, the NOx catalytic conversion efficiency remains stable.
  • step S120 the molar ratio of alkali source to silicon is 0.35, the molar ratio of silicon to aluminum is 25, and the molar ratio of template agent to silicon is 0.18.
  • the catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 19:1, the yield of hydrogen-type SSZ-16 molecular sieve was 81%, and the mass ratio of copper atoms in the SSZ-16 copper-containing catalyst was 2.8%. According to the test results of SCR catalytic performance, the catalytic conversion efficiency of NOx at low temperature of 185°C reaches over 97%, and the catalytic conversion efficiency of NOx at high temperature of 520°C remains above 98%. In the temperature range of 185°C-520°C, the catalytic conversion efficiency of NOx remains stable.
  • Embodiment 6 is a diagrammatic representation of Embodiment 6
  • step S120 the molar ratio of alkali source to silicon is 0.35, the molar ratio of silicon to aluminum is 33, and the molar ratio of template agent to silicon is 0.22.
  • the catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 22:1, the yield of hydrogen-type SSZ-16 molecular sieve was 84%, and the mass ratio of copper atoms in the SSZ-16 copper-containing catalyst was 2.7%.
  • SCR catalytic performance test results show that the catalytic conversion efficiency of NOx at low temperature 200°C reaches over 97%, and the catalytic conversion efficiency of NOx at high temperature 510°C remains above 98%. In the temperature range of 200°C-510°C, the catalytic conversion efficiency of NOx remains stable.
  • Step 110 Dissolving 1,5-bis(methylpiperidinium)pentylammonium hydroxide in deionized water at a mass ratio of 1:3 at room temperature as a templating agent.
  • the catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 22:1, the yield of hydrogen SSZ-16 molecular sieve was 75%, and the mass ratio of copper atoms in the SSZ-16 copper-containing catalyst was 2.6%.
  • SCR catalytic performance test results show that the catalytic conversion efficiency of NOx at low temperature 210°C reaches over 97%, and the catalytic conversion efficiency of NOx at high temperature 460°C maintains above 98%. In the temperature range of 210°C-460°C, the catalytic conversion efficiency of NOx remains stable.
  • step S120 the molar ratio of alkali source to silicon is 0.35, the molar ratio of silicon to aluminum is 25, and the molar ratio of template agent to silicon is 0.15.
  • the FAU type molecular sieve with an equal molar source of silicon and aluminum, wherein sodium silicate is used for the silicon source, and aluminum sulfate is used for the aluminum source.
  • the catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 17:1, the yield of hydrogen SSZ-16 molecular sieve was 70%, and the mass ratio of copper atoms in the SSZ-16 copper-containing catalyst was 2.9%. According to the test results of SCR catalytic performance, the catalytic conversion efficiency of NOx at low temperature 220°C reaches over 97%, and the catalytic conversion efficiency of NOx at high temperature 480°C remains above 98%. In the temperature range of 220°C-480°C, the catalytic conversion efficiency of NOx remains stable.
  • step S120 the molar ratio of alkali source to silicon is 0.35, the molar ratio of silicon to aluminum is 25, and the molar ratio of template agent to silicon is 0.15.
  • the FAU type molecular sieve with an equal molar silicon source and aluminum source, wherein the silicon source uses silica sol, and the aluminum source uses aluminum sulfate.
  • the catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 19:1, the yield of hydrogen-type SSZ-16 molecular sieve was 78%, and the mass ratio of copper atoms in the SSZ-16 copper-containing catalyst was 2.5%.
  • SCR catalytic performance test results show that the catalytic conversion efficiency of NOx at low temperature 210°C reaches over 97%, and the catalytic conversion efficiency of NOx at high temperature 460°C maintains above 98%. In the temperature range of 210°C-460°C, the catalytic conversion efficiency of NOx remains stable.
  • step S120 the molar ratio of alkali source to silicon is 0.35, the molar ratio of silicon to aluminum is 100, and the molar ratio of template agent to silicon is 0.15.
  • the catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 30:1, the yield of hydrogen-type SSZ-16 molecular sieve was 55%, and the mass ratio of copper atoms in the SSZ-16 copper-containing catalyst was 2.0%.
  • SCR catalytic performance test results show that the catalytic conversion efficiency of NOx at low temperature 220°C reaches over 97%, and the catalytic conversion efficiency of NOx at high temperature 360°C maintains above 98%. In the temperature range of 220°C-360°C, the catalytic conversion efficiency of NOx remains stable.
  • the performance of the prepared catalysts of Examples 1-6 of the present invention and Comparative Examples 1-4 are shown in Table 1. From the SCR catalytic performance of the copper-containing molecular sieves obtained in Examples 1 to 6, using the two compounds of chemical formula 1 and chemical formula 2 as templates, good catalytic performance can be obtained under a suitable raw material ratio.
  • comparative example 2 and comparative example 3 are using equal molar silicon source to replace FAU type molecular sieve, the higher regular ratio that has not been obtained, sodium silicate as silicon source contains more sodium ions and causes system alkalinity stronger, in the process of crystal formation, due to the high alkalinity of system, the silicon dioxide in crystal is caused certain digestion, causes lower silicon-aluminum ratio, and the catalytic temperature range is narrower.

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Abstract

L'invention concerne un procédé de préparation d'un catalyseur contenant du cuivre SSZ-16. Dans le procédé, un sel d'ammonium quaternaire disubstitué cyclique à six chaînons qui est utilisé en tant qu'agent structurant organique, un tamis moléculaire de silicium-aluminium de type FAU, une source alcaline, une source de silicium, une source d'aluminium et un germe cristallin sont combinés et sont mélangés uniformément dans de l'eau désionisée de façon à former une solution, un tamis moléculaire SSZ-16 est synthétisé hydrothermiquement au moyen d'une cristallisation dynamique et est ensuite dispersé dans une solution de sel de cuivre, et un catalyseur contenant du cuivre SSZ-16 est obtenu par agitation, filtration et lavage, et séchage et calcination. La surface spécifique élevée et la stabilité hydrothermique élevée du catalyseur contenant du cuivre SSZ-16 permettent à un matériau de présenter une activité et une sélectivité NH3-SCR élevée et une longue durée de vie.
PCT/CN2022/133503 2022-01-18 2022-11-22 Procédé de préparation d'un catalyseur contenant du cuivre ssz-16 WO2023138204A1 (fr)

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